JPH0136093Y2 - - Google Patents

Description

[Detailed explanation of the idea] B. Purpose of the invention E-1 Industrial application fields This invention relates to an improvement in gas meters.

A-2 Prior Art A gas meter that is composed of two measuring membranes and four measuring chambers is in practical use, but it is large, has many parts, and has a complicated structure.

Therefore, a gas meter that is small, has a small number of parts, and has a simple structure has been proposed in Japanese Patent Publication No. 18871-1971. This device consists of one metering membrane and two metering chambers and is compact, but a compression spring is used in the snap action mechanism that instantly moves the switching valve from one limit position to the other limit position. Since the force of the snap action is weakest in the neutral part, there is a possibility that the gas meter will stop if the frictional force of the gas meter operating part increases, and it still uses many parts such as springs and levers. .

A-3 Problems to be solved by the present invention In the conventional technology, the structure of the snap action operating part is complicated, and there are problems with its durability.
There was a problem that instrumental error adjustment could not be performed continuously.

This idea uses a magnet in the snap action actuator to instantaneously move the switching valve using magnetic force, resulting in a simple structure with good durability, and switching by adjusting the amount of shielding of the magnetic circuit. The purpose is to propose a gas meter that can continuously adjust the instrumental difference by changing the valve timing of the valve.

B. Structure of the invention B-1 Means for solving the problems In order to solve the problems mentioned above, the gas meter of this invention is divided into two measuring chambers 3 and 4 by one measuring membrane 2, and each measuring chamber is A lower case 1 having gas inlets and outlets 17 and 18 communicating with the chamber and an outlet 19 communicating with the meter outlet 22, and the inlets and outlets 17 and 18.
a sliding switching valve 23 that can be rotated back and forth between two limit positions in order to alternately communicate with the outlet 19; a driven magnet 27 fixed to the switching valve 23; Drive magnet 1 capable of reciprocating rotation
4, an operating arm 10 that is interlocked with the metering membrane 2 and swings as the metering membrane reciprocates, and the driving magnet 14.
The present invention is characterized in that it includes a connecting arm 15 whose movable end is connected to the swinging end of the operating arm 10, and an iron plate 29 which moves in and out between the two magnets.

RO-2 Action When the sliding switching valve is at one limit position and the inlet/outlet 17 is in communication with the outlet 19 via the switching valve, the gas that has flowed into the meter enters the metering chamber 4 from the inlet/outlet 18 and enters the metering membrane. Move 2 to one side. As the metering membrane 2 moves in one direction, the actuating arm 10 swings in one direction, and the driving magnet 14 moves through the connecting arm 15.
Rotate in one direction. When the driving magnet rotates and reaches a certain position, the direction of the magnetic force exerted on the driven magnet is reversed, and the driven magnet instantaneously moves together with the switching valve to the other limit position by snap action, and the switching valve is switched. That is, the entrance/exit 18 communicates with the exit 19 . Therefore, gas flows into the metering chamber 3 and gas in the metering chamber 4 flows out from the meter. Then, the metering membrane moves in the opposite direction, and the operating arm 1
0, the movements of the connecting arm 15 and the driving magnet 14 are also reversed.

When the driving magnet reaches the other fixed position, the direction of the magnetic force exerted on the driven magnet is reversed, and the switching valve 23 returns to the one limit position with a snap action to switch the gas flow. in this way,
Snap action is performed by the magnetic force of the driving magnet and the driven magnet.

If the iron plate 29 is moved in and out between the two magnets to change the amount of magnetic shielding, the timing when the snap action occurs changes.
Instrument difference adjustment can be performed.

RO-3 Embodiment In Figures 1 to 3, 1 is the lower case,
A metering membrane 2 divides the chamber into metering chambers 3 and 4.

Reference numerals 5 and 6 indicate disc-shaped membrane plates that sandwich the center portion of the metering membrane from both sides. A wing shaft 7 is rotatably supported by the lower case 1, and its upper end passes through the lower case and projects into the upper case 8. Reference numeral 9 denotes a wing whose one end is fixed to the wing shaft 7, and the other end is connected to the center of the metering membrane 2. Reference numeral 10 denotes an operating arm whose one end is fixed to the upper end of the wing shaft 7, and a pin 11 is installed at the other end (swinging end). A bracket 12 has one end fixed to the lower case 1, and a shaft 13 stands at the other end.

14 is a circular driving magnet whose outer periphery is magnetized into four poles at equal intervals, and a pin 13 is loosely engaged with a hole in the center.
It is rotatably supported around this pin 13. A connecting arm 15 has one end fixed integrally with the drive magnet 14, and has a long groove 16 at the other movable end, into which the pin 11 fits, connecting the connecting arm 15 and the operating arm 10. .

Reference numerals 17 and 18 are entrances and exits provided in the upper wall of the lower case 1, which communicate with the measuring chambers 3 and 4, respectively.
19 is an outlet provided on the upper wall of the lower case 1;
0 and communicates with the outlet 22 of the upper case 21. Reference numeral 23 denotes a sliding switching valve that rotatably fits on a fixed shaft 24 set up on the lower case.
8 are alternately connected to the outlet 19. As shown in FIGS. 4A, B, and C, this sliding switching valve 23 has a sector-shaped part 23a with a small circumferential angle and a sector-shaped part 23 with a large circumferential angle.
b is connected to each other, and its inner recess is the passage 23.
It forms c.

25 and 25' are stoppers provided on the upper surface of the upper wall of the lower case 1 for determining the limit position of the switching valve 23. 26 is an inflow portion provided in the upper case 21. 27 is a circular driven magnet fixed to the switching valve, and is magnetized into four poles in the same way as the driving magnet. Reference numeral 28 denotes an operating shaft that is airtightly provided in the upper case 21 and is movable up and down. An L-shaped iron piece 29 is fixed to the lower end, and this iron piece 29 is inserted between the driving magnet 14 and the driven magnet 27. , its position can be changed by moving the operating axis up and down. Further, the detailed shape of the iron piece 29 is shown in FIG.

When the switching valve 23 is in one limit position counterclockwise and in contact with the stopper 25' as shown in FIG.
It leads to outlet 19 via. Therefore, in this state, the gas flowing in from the inlet 26 enters the metering chamber 4 through the open inlet/outlet 18 and moves the metering membrane 2 in the direction of the metering chamber 3 . The gas in the metering chamber 3 flows from the inlet/outlet 17 to the passage 23c of the switching valve 23 and the outlet 1.
9, flows out through the passage 20 to the outflow part 22. At this time, the movement of the metering membrane 2 causes the operating arm 10 to swing through the blade 9 and the blade shaft 7, and rotates the drive magnet 14 through the pin 11 and the connecting arm 15.

The positional relationship among the metering membrane 2, drive magnet 14, driven magnet 27, and switching valve 23 at this time is shown in FIG. 5A.
In FIG. 5, in order to make it easier to understand the mutual relationship between the fan-shaped portion 23a of the switching valve 23 and the inlet/outlet ports 17, 18, the drive magnet 14 and the driven magnet 27 are arranged in reverse left and right. has not changed.

In the state shown in FIG. 5A, the switching valve 23 is
5', and is located at one limit position corresponding to sector 23.
A faces the entrance/exit 17. Therefore, the gas enters one of the metering chambers 4 through the inlet/outlet 18 and the metering membrane 2
Move it downward in the diagram. This movement causes the drive magnet 14 to rotate clockwise in the figure (counterclockwise in FIG. 3). When the magnetic pole N1 slightly rotates from the state shown in A in the figure and slightly passes the position where it opposes the N pole of the driven magnet 27, the magnetic force applied to the driven magnet 27 is reversed, so the driven magnet 27
is instantaneously rotated clockwise together with the switching valve 23 by a snap action, and the switching valve is rotated 45 degrees and moves to the other limit position where it hits the stopper 25. This state is shown in FIG. Then doorway 17 opens,
18 communicates with the outlet through the passage of the switching valve 23, so gas flows into the metering chamber 3 from the inlet/outlet 17.
The metering membrane 2 is moved upward in the same figure. Therefore, the driving magnet 14 starts to rotate counterclockwise in the figure in conjunction with the metering membrane 2. Figure C shows a state in which the metering membrane 2 has moved close to the other limit position.
The drive magnet 14 has been rotated by an angle of slightly less than 45 degrees from the state shown in FIG. When the angle slightly exceeds 45 degrees, the direction of the magnet applied to the driven magnet is reversed, and the driven magnet rotates counterclockwise with a snap action, returning to the one limit position where the switching valve 23 hits the stopper 25'. . The gas is then switched to flow into the metering chamber 4 from the inlet/outlet 18.

The position (so-called timing) of the metering membrane 2 when the switching valve 23 moves from one limit position to the other limit position by snap action can be continuously and minutely changed by changing the amount of magnetic shielding by the iron plate 29. It is. As shown in FIGS. 6A and 6B, the iron plate 29 has a tapered portion 29a, so the further the operating shaft 28 is pushed down, the greater the shielding amount becomes.
The timing of reversal can be changed. That is, the metering membrane is reversed with a small movement, and the amount of gas flowing out is small to perform metering. Therefore, the instrument error is adjusted so that the gas meter measures a large amount.

When the operating shaft is moved in the opposite direction, the instrument is adjusted to measure smaller amounts as a gas meter. Note that the same effect can be obtained even if the moving direction of the iron plate is not limited to the vertical direction shown by arrow A in the figure, but also the front-back direction shown by arrow B.

C. Effects of the invention In this invention, the snap action is performed by magnetic force, so there are fewer parts for the snap action, which simplifies the structure and improves durability. Furthermore, since the repulsive force of the magnet is always the same, it has the advantage of eliminating the drawbacks of the prior art described above.

Further, by moving the iron plate 29, the instrumental error adjustment can be continuously and finely performed.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; Fig. 1 is a longitudinal cross-section taken along the line A-A in Fig. 2, Fig. 2 is a top view, Fig. 3 is a top view with the upper case removed, and Fig. 4. A,
B and C are top views, vertical cross-sectional views, and bottom views of the switching valve. Figures 5 A to D are diagrams for explaining the positional relationship of the metering membrane, drive magnet, and driven magnet. Figure 6 A and B are drive magnets. FIG. 2 is a perspective view and a side view showing the mutual relationship between a magnet, a driven magnet, and an iron plate. DESCRIPTION OF SYMBOLS 1... Lower case, 2... Measuring membrane, 3, 4... Measuring chamber, 10... Operating arm, 14... Drive magnet, 15
...Connection arm, 17, 18... Inlet/outlet, 19... Outlet, 23... Sliding switching valve, 27... Followed magnet, 2
9... Iron plate.

Claims (1)

[Scope of utility model registration request] It is divided into two measuring chambers 3 and 4 by one metering membrane 2, and there are gas entrances and exits 17 and 1 leading to each measuring chamber.
8 and an outlet 19 communicating with the outflow portion 22 of the meter; and a sliding switching valve 23 that is rotatable back and forth between two limit positions to alternately communicate the inlets 17, 18 with the outlet 19. , a driven magnet 27 fixed to the switching valve 23, a drive magnet 14 arranged close to the driven magnet 27 and capable of reciprocating rotation, and an operation that is interlocked with the metering membrane 2 and swings as the metering membrane reciprocates. An arm 10, a connecting arm 15 which is integral with the driving magnet 14 and whose movable end is connected to the swinging end of the operating arm 10, and an iron plate 29 which goes in and out between the two magnets. gas meter.